There is an edit button, which you have discovered for your final post. I suggest you use it.
These bots mutate in a controlled environment, and as such I don't see any real threat to them. Have a look at one of the related links for a real game of core wars (which has its own hills and has been in existence for quite some time).
It's been briefly touched on here before (briefly because it's not really related to backtrack in any way), but look at Immunity Sec's paper on Nematode technology. It's a bit more useful than the Tierra simulation, though it is harder to write.
The whole concept of a supervirus is, at this time, pretty distant IMO. We very rarely get cross platform virus patterns, though it's possible to weaponise software in existence already to cross platform attack thing, the very concept isn't that well supported yet. Nor is it viable - broken programs on *nix based systems tend to be fixed pretty quickly if there is a threat to them, so cross platforming becomes not so useful (even if it is still possible).
Quick mutation virus-like programs have been around for ages. Even a true-polymorphic can get scanned and caught.
Try not to post three times to yourself, you didn't really provide any good information that you couldn't have put in the first post.